| 摘要 |
<p>electrochemical cell simulator circuit provides current flow simulating the faradaic current, oxidation reduction potential and the like of an electrochemical cell. The circuit comprises a pair of interconnection terminals 37, 38 across which a resistance is to be established substantially simulating the faradaic resistance of a cell. A differential amplifier 41 has one input terminal connected to the terminal 37 and Its output terminal connected to the other input terminal and through a resistor 121 to an input terminal of a differential amplifier 42, whose output terminal is connected through a resistor 129 to the other input terminal and to the input of a pair of back-to-back diodes 46, 48, whose output is connected to differential amplifier 50. A compensating operational amplifier 80 with an adjustable feedback resistor 82 is connected across the diode device which acts as a resistance simulator circuit. The output of the amplifier 50 is to a switch 52 connected alternatively to a capacitor 56 or to a Warburg impedance network 58 leading to the input of an amplifier circuit 60.</p><p>There are two key concepts. The first recognises that because the semi-integral of the cell current effectively deconvolves the diffusion aspect of the phenomenon with the resultant describing the surface concentration of reacted species, then the semiderivative of a function describing a surface concentration of reacted species results in an output representing the cell current, including diffusion. The second is embodied in a circuit arrangement properly simulating this concentration behaviour cell double layer potential and in yielding an output proportional to the surface concentration of reactant species corresponding to that potential in response to applied cell barrier potential.</p> |
